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Rayleigh number gas→riser

Symbol
$\mathrm{Ra}_{int}$
Formulas
$\mathrm{Gr}_{og} \mathrm{Pr}_{gas}$object→gas
$\mathrm{Gr}_{gd} \mathrm{Pr}_{gas}$gas→duct
$\mathrm{Gr}_{int} \mathrm{Pr}_{gas}$object→duct
$\frac{g \mathrm{Pr}_{gas} \beta_{gas} \left(\theta_e-\theta_{di}\right) {\delta_d}^3}{{\nu_{gas}}^2}$object→riser, Chippendale, IEC 60287
Related
$\beta_{gas}$
Volumetric thermal expansion coefficient gas [1/K]
$\delta_d$
Distance cable—duct [m]
$g$
Standard acceleration of gravity [m/s$^2$]
$\mathrm{Gr}_{gd}$
Grashof number gas—duct
$\mathrm{Gr}_{og}$
Grashof number cable—gas
$\nu_{gas}$
Kinematic viscosity gas [m$^2$/s]
$\mathrm{Pr}_{gas}$
Prandtl number gas
$\theta_{di}$
Temperature duct inner surface [°C]
$\theta_e$
External temperature object [°C]
Used in
$h_{conv,int}$
Heat transfer coefficient convection cable—riser [W/(K.m$^2$)]
$\mathrm{Nu}_{int}$
Nusselt number cable—riser
$\mathrm{Nu}_{og}$
Nusselt number cable—gas